Jean-michel Gérard | Université Grenoble Alpes (original) (raw)

Papers by Jean-michel Gérard

Research paper thumbnail of Motionnal narrowing in a semiconductor quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2006

International audienc

Research paper thumbnail of Nanowire single-photon sources: mechanics matters (Conference Presentation)

Research paper thumbnail of Efficient longitudinal relaxation of the exciton spin in single in quantum dots

HAL (Le Centre pour la Communication Scientifique Directe), 2005

... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011213/en/. Herausgeber, HA... more ... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011213/en/. Herausgeber, HAL - CCSd - CNRS. Mitarbeiter, Philippe Roussignol. Archiv, CCSd/HAL : e-articles server (based on gBUS) (France). Keywords, Physics/Condensed Matter/Other. Typ, COMMUNICATION ...

Research paper thumbnail of Observation of hot luminescence and slow intersubband relaxation in GaN/AlGaN multi-quantum-well structures

Nucleation and Atmospheric Aerosols, 2007

In this work we discuss the optical properties of GaN/AlxGa1-xN (x=0.11, 0.25) multiple-quantum-w... more In this work we discuss the optical properties of GaN/AlxGa1-xN (x=0.11, 0.25) multiple-quantum-well structures grown by plasma-assisted molecular-beam epitaxy. Photoluminescence lines related to the fundamental and excited electronic levels are identified, in good agreement with simulations of the electronic structure. Temperature dependent studies reveal an anomalous behavior of the photoluminescence intensity, which is the quenching of the e1-hh1 line, while

Research paper thumbnail of High Resolution Electron Microscopy Study of Indium Distribution in InAs/GaAs Multilayers

NATO advanced study institutes series, 1989

Two InAs/GaAs multilayers have been studied using X-Ray diffraction (XR), photoluminescence (PL) ... more Two InAs/GaAs multilayers have been studied using X-Ray diffraction (XR), photoluminescence (PL) and high Resolution Transmission Electron Microscopy (HRTEM) in order to determine the Indium location. X-Ray diffraction has provided the thickness and periodicity of the multilayers. The ones chosen were respectively A : 0.9 monolayer (mL) and B : 1.7 mL thick according to XR measurements. From comparison of their structure we conclude that Indium intermixes with Gallium and gives rise to a thicker film, InGaAs, the Indium proportion being at least 50 %. The interface InAs/GaAs is atomically flat, whereas the interface GaAs/InAs is extremely rough. This may be a way of decreasing the elastic energy.

Research paper thumbnail of Broad Diversity of Near-Infrared Single-Photon Emitters in Silicon

Physical Review Letters, Feb 22, 2021

Research paper thumbnail of A highly efficient single-photon source based on a quantum dot in a photonic wire

HAL (Le Centre pour la Communication Scientifique Directe), 2010

International audienc

Research paper thumbnail of Motionnal narrowing in a single semiconductor quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2006

International audienc

Research paper thumbnail of High Q whispering gallery modes in GaAs/AlAs pillar microcavities

Research paper thumbnail of Giant optical anisotropy in a single InAs quantum dot in a very dilute quantum dot ensemble

HAL (Le Centre pour la Communication Scientifique Directe), 2005

Research paper thumbnail of Giant optical anisotropy in a single InAs quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2005

We present the experimental evidence of giant optical anisotropy in single InAs QDs. Polarization... more We present the experimental evidence of giant optical anisotropy in single InAs QDs. Polarization-resolved photoluminescence spectroscopy in single QDs reveals a linear polarization ratio which fluctuates, from one dot to another, in sign and in magnitude with absolute values up to 82%. We do not observe any dependence of the linear polarization on incident power and temperature.

Research paper thumbnail of Giant optical anisotropy in a single InAs/GaAs quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2004

... Ivan Favero 1 , Guillaume Cassabois 1 , Aleksandar Jankovic 1 , Robson Ferreira 1 , David Dar... more ... Ivan Favero 1 , Guillaume Cassabois 1 , Aleksandar Jankovic 1 , Robson Ferreira 1 , David Darson 1 , Christophe Voisin 1 , Claude Delalande 1 , Philippe Roussignol 1 , Brian Gerardot 3 , Pierre Petroff 3 , Jean-Michel Gérard 2. (2004). ... Contributeur : Philippe Roussignol <>. ...

Research paper thumbnail of Breakdown of the frozen exciton spin picture in quantum dots

HAL (Le Centre pour la Communication Scientifique Directe), 2005

... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011212/en/. Herausgeber, HA... more ... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011212/en/. Herausgeber, HAL - CCSd - CNRS. Mitarbeiter, Philippe Roussignol. Archiv, CCSd/HAL : e-articles server (based on gBUS) (France). Keywords, Physics/Condensed Matter/Other. Typ, COMMUNICATION ...

Research paper thumbnail of Thermal activation of spectral diffusion and broadening of the zero-phonon line in single quantum dots

HAL (Le Centre pour la Communication Scientifique Directe), 2007

The temperature-induced broadening of the optical spectrum is a major issue of the quantum dot op... more The temperature-induced broadening of the optical spectrum is a major issue of the quantum dot optical properties. Temperature-dependent measurements have shown that the line-shape can be described by the superposition of the so-called zero-phonon line and broad side-bands extending on several meV [1]. These side-bands arise from the radiative recombination of electron-hole pairs assisted by the emission and the absorption of acoustic phonons and are quantitatively interpreted in the framework of the Huang-Rhys theory. However, within this theoretical treatment, the zero-phonon line does not show any broadening with temperature in strong contrast with the literature which shows a wide dispersion of the data on the temperature dependence of this zero-phonon line-width [2-5]. We show here that the thermal activation of the processes leading to spectral diffusion in the motional narrowing regime [6] results in a Lorentzian zero-phonon line with a width that increases linearly with temperature. This extrinsic dephasing process is studied by systematic measurements of the linewidth for single quantum dots in the motional narrowing regime, i.e. with a zero-phonon line that keeps a Lorentzian profile in the investigated range of experimental parameters. This contribution to the temperature dependence of the zero-phonon line-width relies on an interaction between acoustic phonons and carriers outside the QDs in contrast with previous models where acoustic phonons interact with carriers inside the dot. Our original model provides a unified interpretation to the published data on the temperature dependence of the zero-phonon line. [1]L. Besombes, K. Kheng, L. Marsal, and H. Mariette, Phys. Rev. B 65, 121314 (2002). [2]C. Kammerer, C. Voisin, G. Cassabois, C. Delalande, Ph. Roussignol, F. Klopf, J. P. Reithmaier, A. Forchel, and J. M. G\'{e}rard, Phys. Rev. B 66, 041306 (2002). [3]B. Urbaszek, E. J. McGhee, M. Kruger, R. J. Warburton, K. Karrai, T. Amand, B. D. Gerardot, P. M. Petroff, and J. M. Garcia, Phys. Rev. B 69, 035304 (2004). [4]G. Ortner, D. R. Yakovlev, M. Bayer, S. Rudin, T. L. Reinecke, S. Fafard, Z. Wasilewski, and A. Forchel, Phys. Rev. B 70, 201301 (2004). [5]P. Borri, W. Langbein, U. Woggon, V. Stavarache, D. Reuter, and A. D. Wieck, Phys. Rev. B 71, 115328 (2005). [6]A. Berthelot, I. Favero, G. Cassabois, C. Voisin, C. Delalande, Ph. Roussignol, R. Ferreira, and J. M. G\'{e}rard, Nature Phys. 2, 759 (2006).

Research paper thumbnail of Giant optical anisotropy in single InAs quantum dots

Physica E-low-dimensional Systems & Nanostructures, Feb 1, 2005

Polarization-resolved photoluminescence (PL) experiments have attracted much attention in recent ... more Polarization-resolved photoluminescence (PL) experiments have attracted much attention in recent years in view of understanding the exciton fine structure in single quantum dots (QDs) [1]. Assuming rotational symmetry of the QD along the growth axis, one predicts two bright ...

Research paper thumbnail of High-quality NbN nanofilms on a GaN/AlN heterostructure

AIP Advances, Oct 1, 2014

Research paper thumbnail of Design of polarization-insensitive superconducting single photon detectors with high-index dielectrics

Superconductor Science and Technology, Jan 9, 2017

Research paper thumbnail of Temperature dependence of the zero-phonon linewidth in quantum dots: An effect of the fluctuating environment

Physical Review B, Feb 28, 2007

Research paper thumbnail of A highly efficient single-photon source based on a quantum dot in a photonic nanowire

Nature Photonics, Jan 31, 2010

Research paper thumbnail of Selective addressing of the optical modes of a micropillar cavity with a white light beam

arXiv (Cornell University), Jul 2, 2010

Research paper thumbnail of Motionnal narrowing in a semiconductor quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2006

International audienc

Research paper thumbnail of Nanowire single-photon sources: mechanics matters (Conference Presentation)

Research paper thumbnail of Efficient longitudinal relaxation of the exciton spin in single in quantum dots

HAL (Le Centre pour la Communication Scientifique Directe), 2005

... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011213/en/. Herausgeber, HA... more ... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011213/en/. Herausgeber, HAL - CCSd - CNRS. Mitarbeiter, Philippe Roussignol. Archiv, CCSd/HAL : e-articles server (based on gBUS) (France). Keywords, Physics/Condensed Matter/Other. Typ, COMMUNICATION ...

Research paper thumbnail of Observation of hot luminescence and slow intersubband relaxation in GaN/AlGaN multi-quantum-well structures

Nucleation and Atmospheric Aerosols, 2007

In this work we discuss the optical properties of GaN/AlxGa1-xN (x=0.11, 0.25) multiple-quantum-w... more In this work we discuss the optical properties of GaN/AlxGa1-xN (x=0.11, 0.25) multiple-quantum-well structures grown by plasma-assisted molecular-beam epitaxy. Photoluminescence lines related to the fundamental and excited electronic levels are identified, in good agreement with simulations of the electronic structure. Temperature dependent studies reveal an anomalous behavior of the photoluminescence intensity, which is the quenching of the e1-hh1 line, while

Research paper thumbnail of High Resolution Electron Microscopy Study of Indium Distribution in InAs/GaAs Multilayers

NATO advanced study institutes series, 1989

Two InAs/GaAs multilayers have been studied using X-Ray diffraction (XR), photoluminescence (PL) ... more Two InAs/GaAs multilayers have been studied using X-Ray diffraction (XR), photoluminescence (PL) and high Resolution Transmission Electron Microscopy (HRTEM) in order to determine the Indium location. X-Ray diffraction has provided the thickness and periodicity of the multilayers. The ones chosen were respectively A : 0.9 monolayer (mL) and B : 1.7 mL thick according to XR measurements. From comparison of their structure we conclude that Indium intermixes with Gallium and gives rise to a thicker film, InGaAs, the Indium proportion being at least 50 %. The interface InAs/GaAs is atomically flat, whereas the interface GaAs/InAs is extremely rough. This may be a way of decreasing the elastic energy.

Research paper thumbnail of Broad Diversity of Near-Infrared Single-Photon Emitters in Silicon

Physical Review Letters, Feb 22, 2021

Research paper thumbnail of A highly efficient single-photon source based on a quantum dot in a photonic wire

HAL (Le Centre pour la Communication Scientifique Directe), 2010

International audienc

Research paper thumbnail of Motionnal narrowing in a single semiconductor quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2006

International audienc

Research paper thumbnail of High Q whispering gallery modes in GaAs/AlAs pillar microcavities

Research paper thumbnail of Giant optical anisotropy in a single InAs quantum dot in a very dilute quantum dot ensemble

HAL (Le Centre pour la Communication Scientifique Directe), 2005

Research paper thumbnail of Giant optical anisotropy in a single InAs quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2005

We present the experimental evidence of giant optical anisotropy in single InAs QDs. Polarization... more We present the experimental evidence of giant optical anisotropy in single InAs QDs. Polarization-resolved photoluminescence spectroscopy in single QDs reveals a linear polarization ratio which fluctuates, from one dot to another, in sign and in magnitude with absolute values up to 82%. We do not observe any dependence of the linear polarization on incident power and temperature.

Research paper thumbnail of Giant optical anisotropy in a single InAs/GaAs quantum dot

HAL (Le Centre pour la Communication Scientifique Directe), 2004

... Ivan Favero 1 , Guillaume Cassabois 1 , Aleksandar Jankovic 1 , Robson Ferreira 1 , David Dar... more ... Ivan Favero 1 , Guillaume Cassabois 1 , Aleksandar Jankovic 1 , Robson Ferreira 1 , David Darson 1 , Christophe Voisin 1 , Claude Delalande 1 , Philippe Roussignol 1 , Brian Gerardot 3 , Pierre Petroff 3 , Jean-Michel Gérard 2. (2004). ... Contributeur : Philippe Roussignol <>. ...

Research paper thumbnail of Breakdown of the frozen exciton spin picture in quantum dots

HAL (Le Centre pour la Communication Scientifique Directe), 2005

... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011212/en/. Herausgeber, HA... more ... Details der Publikation. Download, http://hal.ccsd.cnrs.fr/ccsd-00011212/en/. Herausgeber, HAL - CCSd - CNRS. Mitarbeiter, Philippe Roussignol. Archiv, CCSd/HAL : e-articles server (based on gBUS) (France). Keywords, Physics/Condensed Matter/Other. Typ, COMMUNICATION ...

Research paper thumbnail of Thermal activation of spectral diffusion and broadening of the zero-phonon line in single quantum dots

HAL (Le Centre pour la Communication Scientifique Directe), 2007

The temperature-induced broadening of the optical spectrum is a major issue of the quantum dot op... more The temperature-induced broadening of the optical spectrum is a major issue of the quantum dot optical properties. Temperature-dependent measurements have shown that the line-shape can be described by the superposition of the so-called zero-phonon line and broad side-bands extending on several meV [1]. These side-bands arise from the radiative recombination of electron-hole pairs assisted by the emission and the absorption of acoustic phonons and are quantitatively interpreted in the framework of the Huang-Rhys theory. However, within this theoretical treatment, the zero-phonon line does not show any broadening with temperature in strong contrast with the literature which shows a wide dispersion of the data on the temperature dependence of this zero-phonon line-width [2-5]. We show here that the thermal activation of the processes leading to spectral diffusion in the motional narrowing regime [6] results in a Lorentzian zero-phonon line with a width that increases linearly with temperature. This extrinsic dephasing process is studied by systematic measurements of the linewidth for single quantum dots in the motional narrowing regime, i.e. with a zero-phonon line that keeps a Lorentzian profile in the investigated range of experimental parameters. This contribution to the temperature dependence of the zero-phonon line-width relies on an interaction between acoustic phonons and carriers outside the QDs in contrast with previous models where acoustic phonons interact with carriers inside the dot. Our original model provides a unified interpretation to the published data on the temperature dependence of the zero-phonon line. [1]L. Besombes, K. Kheng, L. Marsal, and H. Mariette, Phys. Rev. B 65, 121314 (2002). [2]C. Kammerer, C. Voisin, G. Cassabois, C. Delalande, Ph. Roussignol, F. Klopf, J. P. Reithmaier, A. Forchel, and J. M. G\'{e}rard, Phys. Rev. B 66, 041306 (2002). [3]B. Urbaszek, E. J. McGhee, M. Kruger, R. J. Warburton, K. Karrai, T. Amand, B. D. Gerardot, P. M. Petroff, and J. M. Garcia, Phys. Rev. B 69, 035304 (2004). [4]G. Ortner, D. R. Yakovlev, M. Bayer, S. Rudin, T. L. Reinecke, S. Fafard, Z. Wasilewski, and A. Forchel, Phys. Rev. B 70, 201301 (2004). [5]P. Borri, W. Langbein, U. Woggon, V. Stavarache, D. Reuter, and A. D. Wieck, Phys. Rev. B 71, 115328 (2005). [6]A. Berthelot, I. Favero, G. Cassabois, C. Voisin, C. Delalande, Ph. Roussignol, R. Ferreira, and J. M. G\'{e}rard, Nature Phys. 2, 759 (2006).

Research paper thumbnail of Giant optical anisotropy in single InAs quantum dots

Physica E-low-dimensional Systems & Nanostructures, Feb 1, 2005

Polarization-resolved photoluminescence (PL) experiments have attracted much attention in recent ... more Polarization-resolved photoluminescence (PL) experiments have attracted much attention in recent years in view of understanding the exciton fine structure in single quantum dots (QDs) [1]. Assuming rotational symmetry of the QD along the growth axis, one predicts two bright ...

Research paper thumbnail of High-quality NbN nanofilms on a GaN/AlN heterostructure

AIP Advances, Oct 1, 2014

Research paper thumbnail of Design of polarization-insensitive superconducting single photon detectors with high-index dielectrics

Superconductor Science and Technology, Jan 9, 2017

Research paper thumbnail of Temperature dependence of the zero-phonon linewidth in quantum dots: An effect of the fluctuating environment

Physical Review B, Feb 28, 2007

Research paper thumbnail of A highly efficient single-photon source based on a quantum dot in a photonic nanowire

Nature Photonics, Jan 31, 2010

Research paper thumbnail of Selective addressing of the optical modes of a micropillar cavity with a white light beam

arXiv (Cornell University), Jul 2, 2010